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Mining Engineering Mining Geology Difficulty: Medium

Trend of a rock bed on ground surface

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Each bore rod one end is male other end If the size of the pillar is 30 m × 30 m; the number of stooks done in pillar is As per CMR 2017, what should be the minimum depth of a sinking shaft for which winding rope made of cold drawn steel wire is recommended to use? Number of swings of shovel for loading one dumper is . . . . . . . . An exhaust fan attached to an evasee of 18 m 2 cross-sectional area at the outlet circulates 150 m 3 /s of air at the pressure of 1000 Pa in a mine ventilation system. The ratio of the inlet to outlet area of the evasee is 1 : 4 and the density of air is 1.2 kg/m 3 . The quantity of air circulated in the mine in absence of evasee is 120 m 3 /s. The eva see efficiency in % is